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added video module - replacement for midentify
added some mocks for images tests
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170
src/lib/video.py
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170
src/lib/video.py
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"""
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Project: pyGTKtalog
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Description: Gather video file information, make "screenshot" with content
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of the movie file. Uses external tools like mplayer and
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ImageMagick tools (montage, convert).
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Type: lib
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Author: Roman 'gryf' Dobosz, gryf73@gmail.com
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Created: 2009-04-04
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"""
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import os
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import shutil
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from tempfile import mkdtemp, mkstemp
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import math
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from misc import float_to_string
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class Video(object):
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"""Class for retrive midentify script output and put it in dict.
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Usually there is no need for such a detailed movie/clip information.
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Midentify script belongs to mplayer package.
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"""
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def __init__(self, filename):
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"""Init class instance. Filename of a video file is required."""
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self.filename = filename
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self.tags = {}
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output = os.popen('midentify "%s"' % self.filename).readlines()
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attrs = {'ID_VIDEO_WIDTH': ['width', int],
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'ID_VIDEO_HEIGHT': ['height', int],
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'ID_LENGTH': ['length', lambda x: int(x.split(".")[0])],
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# length is in seconds
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'ID_DEMUXER': ['container', str],
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'ID_VIDEO_FORMAT': ['video_format', str],
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'ID_VIDEO_CODEC': ['video_codec', str],
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'ID_AUDIO_CODEC': ['audio_codec', str],
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'ID_AUDIO_FORMAT': ['audio_format', str],
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'ID_AUDIO_NCH': ['audio_no_channels', int],}
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for line in output:
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line = line.strip()
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for attr in attrs:
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if attr in line:
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self.tags[attrs[attr][0]] = \
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attrs[attr][1](line.replace("%s=" % attr, ""))
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if 'length' in self.tags:
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if self.tags['length'] > 0:
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hours = self.tags['length'] / 3600
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seconds = self.tags['length'] - hours * 3600
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minutes = seconds / 60
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seconds -= minutes * 60
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length_str = "%02d:%02d:%02d" % (hours, minutes, seconds)
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self.tags['duration'] = length_str
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def capture(self, out_width=1024):
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"""
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Extract images for given video filename and montage it into one, big
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picture, similar to output from Windows Media Player thing, but without
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captions and time (who need it anyway?).
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Arguments:
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@out_width - width of generated image. If actual image width
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exceeds this number scale is performed.
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Returns: image filename or None
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NOTE: You should remove returned file manually, or move it in some
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other place, otherwise it stays in filesystem.
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"""
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if not (self.tags.has_key('length') or self.tags.has_key('width')):
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return None
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# Calculate number of pictures. Base is equivalent 72 pictures for
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# 1:30:00 movie length
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scale = int(10 * math.log(self.tags['length'], math.e) - 11)
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no_pictures = self.tags['length'] / scale
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if no_pictures > 8:
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# for really short movies
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no_pictures = (no_pictures / 8 ) * 8 # only multiple of 8, please.
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if not no_pictures:
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# movie too short or length is 0
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return None
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if no_pictures < 4:
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no_pictures = 4
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tempdir = mkdtemp()
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file_desc, image_fn = mkstemp()
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os.close(file_desc)
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self.__make_captures(tempdir, no_pictures)
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self.__make_montage(tempdir, image_fn, no_pictures, out_width)
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shutil.rmtree(tempdir)
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return image_fn
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def __make_captures(self, directory, no_pictures):
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"""
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Make screens with mplayer into given directory
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Arguments:
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@directory - full output directory name
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@no_pictures - number of pictures to take
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"""
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step = float(self.tags['length']/(no_pictures + 1))
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current_time = 0
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for dummy in range(1, no_pictures + 1):
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current_time += step
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time = float_to_string(current_time)
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cmd = "mplayer \"%s\" -ao null -brightness 0 -hue 0 " \
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"-saturation 0 -contrast 0 -vf-clr -vo jpeg:outdir=\"%s\" -ss %s" \
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" -frames 1 2>/dev/null"
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os.popen(cmd % (self.filename, directory, time)).readlines()
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shutil.move(os.path.join(directory, "00000001.jpg"),
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os.path.join(directory, "picture_%s.jpg" % time))
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def __make_montage(self, directory, image_fn, no_pictures, out_width):
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"""
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Generate one big image from screnshots and optionally resize it.
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Arguments:
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@directory - source directory containing images
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@image_fn - destination final image
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@no_pictures - number of pictures
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@out_width - width of final image to be scaled to.
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"""
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scale = False
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row_length = 4
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if no_pictures < 8:
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row_length = 2
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if (self.tags['width'] * row_length) > out_width:
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scale = True
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else:
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for i in [8, 6, 5]:
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if (no_pictures % i) == 0 and \
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(i * self.tags['width']) <= out_width:
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row_length = i
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break
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tile = "%dx%d" % (row_length, no_pictures / row_length)
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_curdir = os.path.abspath(os.path.curdir)
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os.chdir(directory)
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# composite pictures
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# readlines trick will make to wait for process end
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cmd = "montage -tile %s -geometry +2+2 picture_*.jpg montage.jpg"
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os.popen(cmd % tile).readlines()
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# scale it to minimum 'modern' width: 1024
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if scale:
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cmd = "convert -scale %s montage.jpg montage_scaled.jpg"
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os.popen(cmd % out_width).readlines()
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shutil.move(os.path.join(directory, 'montage_scaled.jpg'),
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image_fn)
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else:
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shutil.move(os.path.join(directory, 'montage.jpg'),
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image_fn)
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os.chdir(_curdir)
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def __str__(self):
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str_out = ''
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for key in self.tags:
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str_out += "%20s: %s\n" % (key, self.tags[key])
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return str_out
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